Printing telegraph operation



942.7 E. P. KOUKOL' I PRINTING TELEGRAPH OPERATION Filed Feb. 27, 1941 INVENTOR. EDWIN P. KOUKOL BYv A ORNEY.

Patented Dec. 8, 1942 y PRINTING TELEGRAPH OPERATION Edwin P. Koukol, Chicago, Ill., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application February 27, 1941, Serial No. 380,910

(llaims. (01.178-69) This invention relates to telegraph apparatus and more particularly to printing telegraph apparatus for recording message matter.

In printing telegraphy at times there are false signals impressed upon the transmission line or received by a printer. Usually these false signals are caused by static electricity or other disturbances in the normal transmission circuit of the printing telegraph apparatus, and it is advisable when false signals are received by a printer to indicate the receipt of such false signal in the apparatus. Several forms of apparatus for indicating the receipt of a false signal by a telegraph printer are disclosed and claimed in the copending application of Louis M. Potts, Serial No. 380,905, filed Feb. 27, 1941. The false signal indicating or misselection indicating apparatus disclosed in the aforementioned patent application of Louis M. Potts is directed to the provision of mechanism for automatically indicating the reception of a false signal. The present application is directed to another form of apparatus for performing the same operation.

It is an objector the present invention to pro vide, in a printing telegraph apparatus, mechanism for indicating the receipt of a false signal by the printing telegraph apparatus.

In accordance with one embodiment of the inventic-n as applied to a tape printing telegraph apparatus of the type wherein type bars are selected and actuated upon the receipt of a proper signal by the printing telegraph apparatus, there is provided a separate type actuating bar or pull bar which is inoperative when a proper signal is received but which is rendered operative When an improper signal is received. Thus unless some code signal is received which calls for a spacing or similar functional operation, the printing bail of the telegraph apparatus is moved through its actuating arc to actuate one of the pull bars and thereby cause a character to be typed on a tape or strip. This character may be a regular character transmitted by representative code signals or it may be the false signal indicating character. The present invention is herein described in connection with tape printing telegraph apparatus responsive to a seven unit code. There are provided seven code bars suitably cut, so that every code signal corresponding to a character to be printed or to a function operation will utilize three marking and four spacing impulses of the seven impulse code, thereby reducing th possibility of erroneously selecting a type bar when false signals are impressed on the transmission circuit.

In the present form of the apparatus, a tiltable ball is placed in substantially vertical alignment beneath the code bars which efiect the selection of the pull bars for actuation, and the tiltable bail in turn control a latch or movable abutit in the code bars.

ment which will b moved out of the path of the special pull bar when th bail is tilted due to the movement of a regular character or functional pull bar into the aligned notches associated with However, when the printing bail starts its upward movement and none of the regular pull bars drops back into the notches in the code bars, the tiltable bail will not rock about its pivot and therefore the abutment will remain in the path of the special pull bar. The printing bail frame which carries the printing bail of the printing apparatus, has fixed to it at the end thereof a bracket carrying a grooved block terminating in a knife edge. A downwardly extending hook is formed on the special pull bar and will engage in the knife-edged groove if the pull bar is held in its outer position by the movable abutment. However, if a proper character code has been received, the pull bar selected will rock the tiltable bail and prevent the special pull bar from being actuated. There is also provided a gong associated with the special pull bar which is sounded when the special pull bar is actuated to attract an operators attention to the fact that an improper code has been received; that is, one which does not have the proper permutation of impulses.

A better understanding of the invention will be had by reference to the following detailed description when considered in conjunction with the accompanying drawing wherein,

Fig. 1 is a vertical-sectional View taken through a portion of a printing telegraph apparatus of the type wherein a plurality of electromagnets control the shifting of code bars to select printer type bars for actuation, and wherein the printer type bars, after being selected, are actuated by a solenoid;

Fig. 2 is a fragmentary perspective view of the special or error indicating pull bar together with the tiltable bail which controls the actuation of the error pull bar and the abutment which will be in the path of the error pull bar when none of the regular pull bars is operated due to the failure of the apparatus to receive a proper signal; and

Fig. 3 is a fragmentary sectional view similar to the upper portion of Fig. 1, except that in Fig. 3, the parts are shown in full lines in the position which they will occupy when a proper signal has been received, the dot and dash lines indicating the possible position of the regular pull bars'and the normal position of the bracket which actuates the special pull bar.

Referring to the drawing wherein like reference characters designate the same parts throughout the several views, particular reference being first had to Fig. 1 wherein the usual printing shaft I0 is shown journaled between the side walls of a telegraph printer framework 2|.

Printing telegraph apparatus of the type described in the present invention is disclosed in Patent No. 1,567,599 to E. E. Kleinschmidt, December 29, 1925. Aifixed to the printer shaft I is a printing frame II carrying a printing bail I2 and stripper roll I3. As is usual in devices of this type, the printer shaft I0 upon oscillation about its axis will operate the usual printing and spacing mechanism designated generally by the numeral I4 and will be actuated solenoid I5 which is interconnected with the frame II by the usual plunger 11.

Positioned at the upper part of the printer framework are the selecting magnets I8 with their associated armatures I9 for controlling the shifting of code bars 20. Fixed to the framework 2| is a plate 22 bent over at its ends as shown in Fig. 2 at 23 and having mounted at the bent over ends, plates 24 which are fixed to the bent over portion 23 of the plate 22 by means of machine screws 25. The plates 24 are L shaped in configuration, as is shown in Fig. 2, and on the portion thereof, which extends parallel with the face of the printer, has a set screw 25 threaded in it for limiting the forward movement of a bail 21 which is pivoted on the side portions of the plate 24 by means of pivot pins 28. The bail 21 carries its horizontal portion in the path of all of the regular pull bars 29 in the printer, and when any" pull bar has been selected by properly shifting the code bars 28 and thereafter rocking the shaft I9 so that the stripper roll I3 will pass into the undercut portion of the pull bars to permit a selected pull bar not held in its outer or counterclockwise position by the code bars to be lifted by the printing bail l2 engaging a shoulder 3| on pull'bars 29. As a selected pull bar 29'falls into the notches in the code bars, the pull bar will rock the bail 21 about its pivot 28. It should be noted at this time that the horizontal portion of the bail has anotch 30 cut in it, so that it will not be operated by an error pull bar to be described.

A flixed to the upper or horizontal surface of the bail 2I is a light' flexible spring member 32 which engages the free end of a piano wire spring 33. Thes'pringis curled, as shown at'34; and is fixed to a bell crank 35which is, in turn, pivotally mounted on a pin 38 which is mounted in the end of a stud 31'. The stud31 is mounted I upon a mounting plate 38 which may be adjustably fixed to the'pl'ate 22 and has'a pair of bent over horizontal portions 39 and 40. "The horizontal portion 40 of the mounting plate 38" has a slot 4| formed in its extending or free end and pivotally supports an abutment member 42- which is pivoted on a pin 43 and normally urged .to rotate in a clockwise direction by 910011 spring 45 fixed to it 'and to the extension 39; the amount of movement of the abutment 42 being limited by a downwardly extending projection 49 formed on it and extending into the slot 4I.'" A slot 9| is provided in the horizontal portion 40 of the mounting plate 38 to allow the'bell crank 35 to move therein and contact with the pivotable abutment member 42. V

The printing fr'ame II has fixed to it, adjacent to one end, an'irregularly shaped member which is secured to the printing frame by niachine screws'56 and has a downwardly extending portiont'l and a horizontally extending portion 58. Thehoriz ontally extending portion 58, as more clearly shownin Fig. 2. extends at right anglesto portion 51 and has at its 'end a block BQ in vvhichthere" is formed a -Vshaped notch which terminates in a knife edge, as shown at 6|. The error pull bar is designated 10 and is of the same general shape and configuration as the ordinary pull bars common to apparatus of this type with the exception that the error pull bar 10 has no shoulder, similar to shoulder 3|, but is rounded in the corresponding area and has a downwardly extending projection 'l'I adapted to cause a bell I2 to be sounded each time the error pull bar"!!! is positively actuated in an upward direction to cause the printing of an error character. In addition, the error pull bar 10 has a hook-shaped projection 13 formed on it for cooperation with the block 59 on the member 55. As will be apparent by a consideration of Fig. 1, particular attention being directed to the bottom portion of the figure, there is provided a clapper or striker 14 in association with the bell 12. The clapper I4 is normally urged away from the bell by a spring 15, the clapper being pivoted at 16,

and having a portion extending as shown at 11 into the path of the downward projection II of the error pull bar 10.

A better understanding may be had of the various structural features of the apparatus covered by the present invention by referring to the following brief description of the mode of operation thereof:

When a proper code signal has been received by the magnets I3, they will, through their armatures I9, shift the code bars 20 to such position that the notches in the code bars will bealigned at one or another of the regular pull bar positions, so that when the pulse to the solenoid energizes it and causes the consequent rocking of the shaft ID, the roll I3 will move up into the narrow portions 30 of the pull bars shown 'in dotted lines in Fig. 3 and the printing bail I2 will thereupon engage that particular 'pull 'bar 29 which has foundthe notches in the code bars aligned at its position. As the roller I3 moves to the area of the pull bars where they are somewhat narrower, one or another of the pull bars will be rocked into the notches in the code bars, and in moving to this position, the pull bar will strike the forward edge of the horizontal portion of the bail 21, causing the bail to rock about its pivot 28. As the bail 2T rocks about its pivot 28, the spring member 32 will move the spring 33 in a clockwise direction, Fig. 2} thereby to'rock the bell crank 35 about the pin 35. When the bell crank 35 rocks about the pin 36 in'a clockwise direction, it will force the abutment 42 from the position shown in 'solid lines over the position shown in dot and dash lines in Fig. 2. When' the abutment 42 has thus been moved out 'of the path of the error pull bar ID, the error pull bar will be moved rearwardly by its spring 69 and will assume the position 'shown in 'Fig'. 3'where there is shown an' arcuat dot and dash line I9 which indicates the path of travel of 'the knife edge 6|. It should be noted that the knife edge 6|, as shownin Fig.3, misses "the edge of the hook-shaped projection'l3 of the error'pull bar It. It should also be noted that the bail 21 has the small notch 30 cut mat to insure that the error pull bar It! will not cause the bail 2! to be operated.

The condition illustrated in Fig. 1 is the condition prevailing when an erroneous or false signal is received by the "magnet I8, and the code bars at 20 are not" shiftedto a position where any one of the regular pull bars 29 may fall into aligned notches in the code bars or for any other reason no pull bar 29 is selected. When this occurs, the knife edge 6| will follow the dot and dash line 8! which indicates the path of travel of the knife, edge Bl. It will be noted that the knife edge 6l will engage the hookshaped projection 13 of the error pull bar and will lift the pull bar upwardly. This operation will cause an error indicating type bar 82 to be actuated through the usual type bar actuating member 83 operatively connected to the error pull bar 10, thereby to cause the type bar 82 to assume the position shown in dot and dash lines in Fig. l to cause an impression to be made on the tape being printed. The upward movement of pull bar It will also cause the bell '12 to be sounded by the clapper l -i being moved by the projection H on the pull bar.

Although a specific embodiment of the invention has been described hereinbefore, it will be understood that modification and adaptations thereof may be made without departing from the scope of the appended claims.

What is claimed is:

1. In a printing telegraph apparatus, selectable actuating elements, code selector means for selecting said actuators, a member positioned to be actuated by any selected one of said actuating elements, a false signal indicating means, an actuator for said last mentioned means, and means controlled by said member for holding part of the false signal indicating means in the path of its actuator until a selectable actuating element is selected.

2. In a printing telegraph apparatus, selectable type actuating elements, a bail positioned to be actuated by any type actuating element which is selected, a false signal indicating element, means for actuating said false signal indicating element, and means controlled by the bail for holding said false signal indicating element in the path of its actuating means until a selectable type actuating element is selected.

3. In a printing telegraph apparatus, a false signal indicating means, means for actuating said indicating means, means for normally holding a part of the false signal indicating means in the path of its actuating means, a plurality of actuators, code selector means for selecting said actuators, and means common to said actuators and actuatable by any selected one of them for moving the holding means out of its normal position.

4. In a printing telegraph apparatus, a false signal indicating means, means for actuating said indicating means, a pivoted member normally holding part of said indicating means in the path of its actuating means, and means for moving the pivoted member from its normal position comprising a plurality of actuators, code selector means for selecting said actuators, and means common to all of said actuators and actuatable by any selected one of said actuators.

5. In a printing telegraph apparatus, a plurality of selectable bars, a bail for actuating any selected one of said bars, a second bail common to all of said bars and actuatable by any selected bar, a false signal pull bar having a hook portion formed thereon, a hook engaging member secured to said first bail for actuating the false signal pull bar, and means under control of the second bail for holding the said hook portion in the path of the hook engaging member.

6. In a printing telegraph apparatus, a plurality of selectable bars, a bail for actuating any selected one of said bars, a second bail common to all of said bars and actuatable by any selected bar, a falsesignal pull bar having a hook portion formed thereon, a hook engaging member secured to said first bail for actuating the false signal pull bar, a lever fixed to the second bail, a spring arm resiliently engaging said lever, a bell crank lever supporting said spring arm, and a pivoted abutment member normally urged to a position where one end of it engages the false signal pull bar to hold the hook portion thereof in the path of the hook engaging member and the other end thereof engages one arm of the bell crank lever.

7. In a printing telegraph apparatus, a plurality of selectable bars, a bail for actuating any selected one of said bars, a second bail common to all of said bars and actuatable by any selected bar, a false signal pull bar having a hook portion formed thereon, a hook engaging member secured to said first bail for actuating the false signal pull bar, an abutment member for normally holding the false signal pull bar in position where the hook portion thereof is in the path of the hook engaging member, and means interconnecting the second bail and the abutment member.

8. In a printing telegraph apparatus, a plurality of selectable bars, a bail for actuating any selected one of said bars, a second bail common to all of said bars and actuatable by any selected bar, a false signal pull bar having a hook portion formed thereon, a hook engaging member secured to said first bail for actuating the false signal pull bar, an abutment member for normally holding the false signal pull bar in position where the hook portion thereof is in the path of the hook enaging member, and a resilient leverage mechanism interconnecting the second bail and the abutment member.

9. In a printing telegraph apparatus, a plurality of selectable bars, a bail for actuating any selected one of said bars, a second bail common to all of said bars and actuatable by any selected bar, a false signal pull bar having a hook portion formed thereon, a hook engaging member secured to said first bail for actuating the false signal pull bar, an abutment member for normally holding the false signal pull bar in position where the hook portion thereof is in the path of the hook engaging member, a spring for holding the abutment member in its normal position, a bell crank lever for moving the abutment member from its normal position, and resilient means interconnecting the bell crank and the second bail.

10. In a printing telegraph apparatus, a plurality of selectable bars, a bail for actuating any selected one of said bars, a second bail common to all of said bars and actuatable by any selected bar, a false signal pull bar having a hook portion formed thereon, a hook engaging member secured to said first bail for actuating the false signal pull bar, an abutment member for normally holding the false signal pull bar in position where the hook portion thereof is in the path of the hook engaging member, a spring for holding the abutment member in its normal position, a bell crank lever for moving the abutment member from its normal position, a relatively stiff spring arm fixed to the bell crank, and a leaf spring fixed to the second bail and engaging the free end of the relatively stifi spring arm.

EDWIN P. KOUKOL. 

